The development and stability of porosity formed during the pyrolysis of polyborodiphenylsiloxane

Howard M. Williams; Elizabeth A. Dawson; Philip A. Barnes; Brian Rand; Rik M D Brydson

doi:10.1016/j.micromeso.2006.09.028

The development and stability of porosity formed during the pyrolysis of polyborodiphenylsiloxane

Howard M. Williams, Elizabeth A. Dawson, Philip A. Barnes, Brian Rand, Rik M D Brydson

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

The pyrolysis of polyborodiphenylsiloxane has been studied at temperatures up to 1600 °C under an inert atmosphere. Above 1200 °C both a nano-scale β-SiC and an amorphous phase developed while at temperatures greater than 1400 °C significant mesoporosity started to appear, with surface areas and pore volumes reaching maximum values at around 1500 °C. The porosity decreased at higher pyrolysis temperatures and disappeared completely when the material was subsequently heated in an oxidising atmosphere at temperatures above 400 °C. The mesoporosity seems to be present in carbon rich areas which appeared when SiC started to crystallise. EELS showed that boron was present at all pyrolysis temperatures. Comparisons are made with the pyrolysis of polycarbosilane.

Original language	English
Pages (from-to)	261-267
Number of pages	7
Journal	Microporous and Mesoporous Materials
Volume	99
Issue number	3
DOIs	https://doi.org/10.1016/j.micromeso.2006.09.028
Publication status	Published - 10 Feb 2007

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10.1016/j.micromeso.2006.09.028

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title = "The development and stability of porosity formed during the pyrolysis of polyborodiphenylsiloxane",

abstract = "The pyrolysis of polyborodiphenylsiloxane has been studied at temperatures up to 1600 °C under an inert atmosphere. Above 1200 °C both a nano-scale β-SiC and an amorphous phase developed while at temperatures greater than 1400 °C significant mesoporosity started to appear, with surface areas and pore volumes reaching maximum values at around 1500 °C. The porosity decreased at higher pyrolysis temperatures and disappeared completely when the material was subsequently heated in an oxidising atmosphere at temperatures above 400 °C. The mesoporosity seems to be present in carbon rich areas which appeared when SiC started to crystallise. EELS showed that boron was present at all pyrolysis temperatures. Comparisons are made with the pyrolysis of polycarbosilane.",

keywords = "Mesoporosity, Polyborodiphenylsiloxane, Pore stability, Pyrolysis, Structural changes",

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T1 - The development and stability of porosity formed during the pyrolysis of polyborodiphenylsiloxane

AU - Williams, Howard M.

AU - Dawson, Elizabeth A.

AU - Barnes, Philip A.

AU - Rand, Brian

AU - Brydson, Rik M D

PY - 2007/2/10

Y1 - 2007/2/10

N2 - The pyrolysis of polyborodiphenylsiloxane has been studied at temperatures up to 1600 °C under an inert atmosphere. Above 1200 °C both a nano-scale β-SiC and an amorphous phase developed while at temperatures greater than 1400 °C significant mesoporosity started to appear, with surface areas and pore volumes reaching maximum values at around 1500 °C. The porosity decreased at higher pyrolysis temperatures and disappeared completely when the material was subsequently heated in an oxidising atmosphere at temperatures above 400 °C. The mesoporosity seems to be present in carbon rich areas which appeared when SiC started to crystallise. EELS showed that boron was present at all pyrolysis temperatures. Comparisons are made with the pyrolysis of polycarbosilane.

AB - The pyrolysis of polyborodiphenylsiloxane has been studied at temperatures up to 1600 °C under an inert atmosphere. Above 1200 °C both a nano-scale β-SiC and an amorphous phase developed while at temperatures greater than 1400 °C significant mesoporosity started to appear, with surface areas and pore volumes reaching maximum values at around 1500 °C. The porosity decreased at higher pyrolysis temperatures and disappeared completely when the material was subsequently heated in an oxidising atmosphere at temperatures above 400 °C. The mesoporosity seems to be present in carbon rich areas which appeared when SiC started to crystallise. EELS showed that boron was present at all pyrolysis temperatures. Comparisons are made with the pyrolysis of polycarbosilane.

KW - Mesoporosity

KW - Polyborodiphenylsiloxane

KW - Pore stability

KW - Pyrolysis

KW - Structural changes

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DO - 10.1016/j.micromeso.2006.09.028

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JO - Microporous Materials

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The development and stability of porosity formed during the pyrolysis of polyborodiphenylsiloxane

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